50 lines
2.0 KiB
Nix
50 lines
2.0 KiB
Nix
final: prev:
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let
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inherit (prev.lib.attrsets) mapAttrs isAttrs filterAttrs listToAttrs nameValuePair attrNames mapAttrsToList;
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inherit (prev.lib.lists) foldr imap0 imap1;
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in prev.lib.attrsets // rec {
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# a -> [String] -> AttrSet{a}
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mapToAttrsWithConst = constant: items:
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listToAttrs (map (name: nameValuePair name constant) items);
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# [AttrSet] -> AttrSet
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concatAttrs = foldr (a: b: a // b) {};
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# (Int -> String -> a -> a) -> AttrSet -> AttrSet
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imap0Attrs = f: set:
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listToAttrs (imap0 (i: attr: nameValuePair attr (f i attr set.${attr})) (attrNames set));
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# (Int -> String -> a -> a) -> AttrSet -> AttrSet
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imap1Attrs = f: set:
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listToAttrs (imap1 (i: attr: nameValuePair attr (f i attr set.${attr})) (attrNames set));
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# (Int -> String -> a -> nameValuePair) -> AttrSet -> AttrSet
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imap0Attrs' = f: set:
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listToAttrs (imap0 (i: attr: f i attr set.${attr}) (attrNames set));
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# (Int -> String -> a -> nameValuePair) -> AttrSet -> AttrSet
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imap1Attrs' = f: set:
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listToAttrs (imap1 (i: attr: f i attr set.${attr}) (attrNames set));
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# AttrSet -> AttrSet
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recursivelyFlatten = set: let
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shouldRecurse = filterAttrs (n: v: isAttrs v) set;
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shouldNotRecurse = filterAttrs (n: v: !(isAttrs v)) set;
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recursedAttrs = mapAttrsToList (n: v: recursivelyFlatten v) shouldRecurse;
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in
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concatAttrs ([shouldNotRecurse] ++ recursedAttrs);
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# Takes in a predicate which decides whether or not to recurse further. (true -> recurse)
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# This will let you recurse until you recurse until you hit attrsets with a special meaning
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# that you would like to handle after flattening.
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# It will also stop at everything other than an attribute set.
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#
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# (a -> Bool) -> AttrSet -> AttrSet
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recursivelyFlattenUntil = pred: set: let
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shouldRecurse = filterAttrs (n: v: isAttrs v && !(pred v)) set;
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shouldNotRecurse = filterAttrs (n: v: !(isAttrs v) || pred v) set;
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recursedAttrs = mapAttrsToList (n: v: recursivelyFlattenUntil pred v) shouldRecurse;
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in
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concatAttrs ([shouldNotRecurse] ++ recursedAttrs);
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}
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